C# winform 饼图

hkjzxc 2010-06-06 09:02:39

winform下的饼图来自textbox里，请问怎么实现？

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xiongxyt2 2010-06-06

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http://www.cnblogs.com/ly5201314/archive/2009/04/01/1427226.html

hkjzxc 2010-06-06

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[Quote=引用 7 楼 cdcjk 的回复:]
加油！多敲、多想、多问
[/Quote]
嗯嗯，再问呢

private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
//3D Pie chart
g.SmoothingMode = SmoothingMode.AntiAlias;
Rectangle er=new Rectangle(300, 150, 300, 200);
Rectangle br=er;
br.Offset(0,30);

g.DrawEllipse(Pens.Gray, br);

g.FillPie(new SolidBrush(Color.FromArgb(200, Color.Red)), er, 0, 120);
g.FillPie(new SolidBrush(Color.FromArgb(200, Color.Purple)), er, 120, 100);
g.FillPie(new SolidBrush(Color.FromArgb(200, Color.Blue)), er, 220, 140);

GraphicsPath gpg = new GraphicsPath();
gpg.AddArc(er, 0, 180);
gpg.AddLine(er.Left, er.Top + er.Height / 2, br.Left, br.Top + br.Height / 2);
gpg.AddArc(br, 0, 180);
gpg.AddLine(br.Left + br.Width, br.Top + br.Height / 2,er.Left + er.Width, er.Top + er.Height / 2);

//Draw pie borders
g.DrawPie(Pens.Goldenrod, er, 0, 120);
g.DrawPie(Pens.Goldenrod, er, 120, 240);
g.DrawEllipse(Pens.Goldenrod, er);

//multi color gradient
Point StartPoint = new Point(er.Left,0);
Point EndPoint = new Point(er.Left + er.Width, 0);
Color[] GColors ={
Color.Red,
Color.White,
Color.Red
};
float[] GPoints ={
0.0f,
0.8f,
1.0f
};
ColorBlend CB = new ColorBlend();
CB.Colors = GColors;
CB.Positions = GPoints;
LinearGradientBrush lgb = new LinearGradientBrush(StartPoint, EndPoint, Color.Red, Color.Red);
lgb.InterpolationColors = CB;

g.FillPath(lgb, gpg);

lgb.Dispose();
gpg.Dispose();
g.Dispose();
}
这个代码生成了一个饼图，那怎么改变他的大小，通过textbox里的数值。